Released today, a good overview in this press release: http://www.microsoft.com/presspass/features/2008/jun08/06-26hyperv.mspx
Time to upgrade your EPM VPCs: http://blogs.msdn.com/chrisfie/archive/2008/06/25/how-to-upgrade-microsoft-project-vpc-to-hyper-v.aspx
This is the complete Hyper-V RTM package for Windows Server 2008 x64. This package must be installed on the Hyper-V Parent Partition. It includes the Hyper-V Server components for Full and Core installations. In addition, is contains the Windows Server 2008 Hyper-V Management components for Full installations. Note This package is permanent. Once installed, it cannot be uninstalled.
Please find an important announcement from the SharePoint team that impact the Project Server 2007 world